*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19732
19740
19752
19760
19770
19781
19791
19801
19811
19821
19832
19842
19854
19860
19870
19880
19892
19900
19910
19921
19932
19941
19952
19960
19970
19980
19993
20001
20010
20020
20030
20040
20051
20062
20070
20080
20090
20104
20111
20120
20134
20142
20150
20161
20172
20183
20191
20202
20214
20222
20235
20240
Total64